Add and Remove Nodes

Note The terms "Unidirectional Path Switched Ring" and "UPSR" may appear in Cisco literature. These terms do not refer to using Cisco ONS 15xxx products in a unidirectional path switched ring configuration. Rather, these terms, as well as "Path Protected Mesh Network" and "PPMN," refer generally to Cisco's path protection feature, which may be used in any topological network configuration. Cisco does not recommend using its path protection feature in any particular topological network configuration.

5. A262 Add a Node to a Linear ADM—Complete as needed to add a node to the end of a linear ADM. This procedure can be used to add a node between two linear ADM nodes, but requires that circuits be deleted and recreated. To add a node without disrupting traffic, use the following procedure.

Caution Adding a BLSR node can be service affecting and should be performed during a maintenance window.

Step 1 Check the software version on the node you are adding to the BLSR from the node view Maintenance > Software subtab. If it is not the same version as the nodes in the ring, you must upgrade or downgrade the new node to the same version as the other nodes in the ring. Refer to the release-specific software upgrade guide for more information on upgrading the ONS node software.

Step 2 Draw a diagram of the BLSR where you will add the node. In the diagram, identify the east and west BLSR OC-N trunk (span) cards that will connect to the new node. This information is essential to complete this procedure without error. Figure 14-1 shows a drawing of a three-node, two-fiber BLSR that uses Slots 5 and 12 for the BLSR trunk cards. The dashed arrow shows the new fiber connections that will be made to add the fourth node to the BLSR.

Figure 14-1 Three-Node, Two-Fiber BLSR Before a Fourth Node Is Added

Figure 14-2 shows a sample drawing of a three-node, four-fiber BLSR. The dashed arrow shows the new fiber connections that will be made to add the fourth node. For four-fiber BLSRs, two fiber sets will be reconnected, the working fiber and the protect fiber.

Step 5 Verify that fiber is available to connect the new node to the existing nodes. Refer to the diagram drawn in Step 2.

Step 6 Complete the "NTP-A35 Verify Node Turn-Up" procedure. In order to have CTC visibility to the new node after it is added, you must be an authorized user on the node and you must have IP connectivity to the node.

Step 7 Create a static route on the new node if the following conditions are present. If the conditions are not present, continue with Step 8.

•The IP address for the new node is on the same subnet as other nodes in the network.

•On the Provisioning > Network > General subtab, the Enable Socks Proxy on Port and External Network Element (ENE) options are not selected under Gateway Settings on the new node.

•A CTC computer is directly connected to the new node.

•CTC computers are directly connected to other nodes on the same subnet.

If these conditions are present, add static routes on the node that will be added to the BLSR, using the following settings:

b. Verify that no unexplained alarms appear on the network. If alarms appear, investigate and resolve them before continuing. Refer to the Cisco ONS 15454 Troubleshooting Guide for procedures.

Step 22 Following the diagram created in Step 2, remove the fiber connections from the two nodes that will connect to the new node.

a. Remove the west fiber from the node that will connect to the east port of the new node. In the Figure 14-1 example, this is Node 1, Slot 5, and in Figure 14-2 this is Node 1, Slots 5 and 6.

b. Remove the east fiber from the node that will connect to the west port of the new node. In the Figure 14-1 example, this is Node 3, Slot 12, and in Figure 14-2 this is Node 3, Slots 12 and 13.

Step 23 Connect fibers from the adjacent nodes to the new node following the diagram created in Step 2. Connect the west port to the east port and the east port to the west port. For four-fiber BLSRs, connect the protect fibers.

Step 24 After the newly added node appears in network view, double-click it to display the node in node view.

Step 25 Click the Provisioning > BLSR tabs.

Step 26 Click Ring Map. Verify that the new node appears on the Ring Map with the other BLSR nodes, then click OK.

Step 27 From the View menu, choose Go to Network View and check the following:

a. Click the Provisioning > BLSR tabs. Verify that the new node appears under the Node column.

If the new node does not appear in the Node column, or if BLSR alarms are present, log into the new node and verify that the BLSR is provisioned on it correctly with the information from Steps 11 and 12. If the node still does not appear, or if alarms persist, refer to the Cisco ONS 15454 Troubleshooting Guide.

Step 28 Click the Circuits tab. Wait until all the circuits are discovered. The circuits that pass through the new node will be shown as incomplete.

Note If the circuits take more than a minute to appear, log out of CTC, then log back in.

Step 29 In network view, right-click the new node and choose Update Circuits With The New Node from the shortcut menu. Verify that the number of updated circuits in the dialog box is correct.

Step 30 If incomplete circuits are still present, refer to the Cisco ONS 15454 Troubleshooting Guide.

Step 31 Click the History tab. Verify that BLSR_RESYNC conditions appear for every node in the BLSR.

Caution The following procedure minimizes traffic outages during node removals. You will delete all circuits that originate and terminate on the node that will be removed. In addition, you will verify that circuits passing through the node do not enter and exit the node on different STSs and/or VTs. If they do, you will delete and recreate the circuits, and traffic will be lost during this time.

Note If you remove a node that is the only building integrated timing supply (BITS) for the ring, you also remove the only source of synchronization for all the nodes in that ring. Circuits that leave the ring to connect to other networks synchronized to a Stratum 1 clock will experience a high level of pointer adjustments, which might adversely affect traffic performance.

Step 4 Create a diagram of the BLSR where you will remove the node. You can draw the BLSR manually, or print it from CTC by performing the following steps:

a. From the View menu, choose Go to Network View.

b. Click the Provisioning > BLSR tabs.

c. Choose the desired BLSR, then click Edit.

d. In the BLSR window, verify that all the port information is visible. If not, press Ctrl and drag the node icons to a new location so the information can be viewed.

Step 7 From the View menu, choose Go to Other Node. Choose the node that you will remove and click OK.

Step 8 Click the Circuits tab. If the Scope setting is set to Network, choose Node from the Scope drop-down list. Make sure that the Filter button is off (not indented) to ensure that all circuits are visible.

Step 10 Complete the "DLP-A442 Verify Pass-Through Circuits" task to verify that circuits passing through the target node enter and exit the node on the same STS and/or VT. K3 extension byte mapping is supported on all ONS 15600 OC-48 and OC-192 traffic cards, as well as the ONS 15454 OC-48 AS card.

Step 11 From the View menu, choose Go to Network View.

Step 12 Referring to the diagram created in Step 4, complete the "DLP-A303 Initiate a BLSR Force Ring Switch" task at each node that connects to the target (removal) node to force traffic away from it. You must perform a Force switch at each port connected to the target node. For example, in Figure 14-3, you would perform a Force switch on the east port of Node 3 and the west port of Node 1.

Step 24 Click the Circuits tab and verify that no incomplete circuits are present. If incomplete circuits appear, repeat Steps 22 and 23.

Step 25 If you delete a node that was in a login node group, you will see incomplete circuits for that node in the CTC network view. Although it is no longer part of the ring, the removed node still reports to CTC until it is no longer in a login node group. If necessary, complete the "DLP-A372 Delete a Node from a Specified Login Node Group" task.

Step 26 To remove another node from a BLSR, repeat this procedure for the desired node.

Step 2 Log into an existing node in the path protection configuration where you want to add a node. See the "DLP-A60 Log into CTC" task for instructions. In order to have CTC visibility to the new node after it is added, you must be an authorized user on the node and you must have IP connectivity to the node.

Step 3 Complete the "DLP-A298 Check the Network for Alarms and Conditions" task to verify that the path protection configuration is free of major alarms or problems. If trouble is indicated (for example, a major alarm exists), resolve the problem before proceeding. See the Cisco ONS 15454 Troubleshooting Guide, as necessary.

Step 4 Count the total number of circuits on the fiber that is cut between the existing nodes. To count the number of circuits, right click on the fiber that is cut, and click circuits.

Step 5 In network view, click the Circuits tab.

To view Partial circuits, click the Filter button and select PARTIAL from the Status drop-down list. The Partial circuits, if any, are displayed.

To view Partial_TL1 circuits, click the Filter button and select PARTIAL_TL1 from the Status drop-down list. The Partial_TL1 circuits, if any, are displayed.

Resolve any partial circuits (both Partial and Partial_TL1) in the network before proceeding. However, if you want to continue with Step 6, match the number of partial circuits and circuit names that existed before and after adding a path protection node. This ensures that no additional partial circuits are created after this procedure is completed.

Step 6 Verify the card installation on the new node. See the "NTP-A323 Verify Card Installation" procedure. Check that the OC-N cards that will serve as the path protection trunk (span) cards match the path protection optical rate of the trunk cards to which the new node will be connected. For example, if the adjacent nodes have OC-48 trunk cards, the new node must have OC-48 cards installed. If the OC-N cards are not installed or the rate does not match the rate of the adjacent node trunk cards, complete the "NTP-A16 Install Optical Cards and Connectors" procedure to install them.

Step 7 Verify that fiber is available to connect the new node to the existing nodes.

Step 11 Click the Alarms tab. Verify that no critical or major alarms are present, nor any facility alarms, such as LOS, LOF, AIS-L, SF, and SD. If trouble is indicated (for example, a major alarm exists), resolve the problem before proceeding. See the Cisco ONS 15454 Troubleshooting Guide, as necessary.

Step 12 In network view, click the Circuits tab.

To view Partial circuits, click the Filter button and select PARTIAL from the Status drop-down list. The Partial circuits, if any, are displayed.

To view Partial_TL1 circuits, click the Filter button and select PARTIAL_TL1 from the Status drop-down list. The Partial_TL1 circuits, if any, are displayed.

Resolve any partial circuits (both Partial and Partial_TL1) in the network before proceeding. However, if you want to continue with Step 13, match the number of partial circuits and circuit names that existed before and after adding a path protection node. This ensures that no additional partial circuits are created after this procedure is completed.

Step 17 Two nodes will connect directly to the new node; remove their fiber connections:

a. Remove the east fiber connection from the node that will connect to the west port of the new node.

b. Remove the west fiber connection from the node that will connect to the east port of the new node.

Step 18 Replace the removed fibers with the fibers that are connected to the new node.

Step 19 Log out of CTC and log back into a node in the network.

Step 20 From the View menu, choose Go to Network View to display the path protection nodes. The new node should appear in the network map. Wait for a few minutes to allow all the nodes to appear.

Step 21 Click the Circuits tab and wait for all the circuits to appear, including spans. Count the number of incomplete circuits.

Note UNEQ-P alarms might appear on the nodes in your network; this is normal, and the alarms will clear after the circuits are updated.

Step 22 Ensure that nodes involved in the node addition operation are in the initialized state. This is because, CTC does not consider nodes that are not initialized (they appear as gray icons in the CTC network map) when evaluating the circuits.

Note Step 23 is recommended to be performed only on nodes (the newly added node, and the existing two nodes in the network between which the new node is added) involved in the node addition operation. Disable network discovery while launching CTC, add only those nodes involved in the node addition operation.

Note CTC automatically creates VT Tunnels. The cross connects should not be created manually in the intermediate nodes.

Note Step 23 does not create the overlay ring circuits that route traffic around multiple rings passing through one or more nodes more than once, on the new node.

Step 23 In the network view, right-click the new node and choose Update Circuits With New Node from the shortcut menu. Wait for the confirmation dialog box to appear. Verify that the number of updated circuits in the dialog box is correct (the circuit count should be same as obtained in Step 4).

Step 24 Click the Circuits tab and verify that no incomplete circuits are present. However, if the partial circuits still exist in the network, verify whether they were present inStep 5 and Step 12. This will ensure that no additional partial circuits are created by this procedure.

Note If the circuits take more than a minute to appear, log out of CTC, then log back in.

Caution The following procedure minimizes traffic outages during node removals.

Caution If you remove a node that is the only BITS timing source for the ring, you also remove the only source of synchronization for all the nodes in that ring. Circuits that connect to other networks that are synchronized to a Stratum 1 clock will experience a high level of pointer adjustments, which might adversely affect customer service.

Step 1 Draw a diagram of the path protection configuration where you will remove the node. In the diagram, identify the following:

•The node that is connected through its west port to the node that will be removed.

•The node that is connected through its east port to the node that will be removed.

Step 4 Complete the "DLP-A333 Delete Circuits" task for circuits that originate or terminate in the node you will remove. (If a circuit has multiple drops, delete only the drops that terminate on the node you are deleting.)

Step 10 Log into each newly connected node and click the Alarms tab. Verify that the span cards are free of alarms. Resolve any alarms before proceeding. Refer to the Cisco ONS 15454 Troubleshooting Guide.

Step 16 Click the Circuits tab and verify that no incomplete circuits are present. If incomplete circuits appear, repeat Steps 14 and 15.

Step 17 If you delete a node that was in a login node group, you will see incomplete circuits for that node in the CTC network view. Although it is no longer part of the ring, the removed node still reports to CTC until it is no longer in a login node group. If necessary, complete the "DLP-A372 Delete a Node from a Specified Login Node Group" task.

Step 18 To remove another node from a path protection configuration, repeat this procedure for the desired node.

Stop. You have completed this procedure.

NTP-A262 Add a Node to a Linear ADM

Purpose

This procedure adds a single ONS 15454 node to the end of an ONS 15454 linear add-drop multiplexer (ADM) network. If the linear ADM carries traffic, you cannot add a node between two linear ADM nodes using this procedure unless you delete and recreate the circuits. To avoid deleting and recreating the circuits, use the "NTP-A323 Add a Node to a Linear ADM Using the Wizard" procedure to add a node between two linear ADM nodes.

Note Optical transmit and receive levels should be in their acceptable range as shown in the specifications section for each card in Table 2-5.

Note In a linear ADM configuration, two OC-N cards in 1+1 protection are connected to two OC-N cards in 1+1 protection on a second node. On the second node, two more OC-N cards are connected to a third node. The third node can be connected to a fourth node, and so on, depending on the number of nodes in the linear ADM. Slots 1 to 4 and 14 to 17 or Slots 5 to 6 and 12 to 13 can be used if connections between nodes are consistent. For example, Slot 5 on the first linear ADM node connects to Slot 5 on the second linear ADM node for the working path, and Slot 6 connects to Slot 6 for the protect path. The working OC-N ports have DCC terminations, and the OC-N cards are in a 1+1 protection group.

Step 5 Complete the "DLP-A377 Provision Section DCC Terminations" task for the working OC-N card at the new node. Make sure to set the port service state in the Create SDCC Termination dialog box to IS. (Do not create a DCC termination on the protect card.)

Note DCC failure alarms appear until you create DCC terminations in the linear ADM node and connect the fiber during Step 12.

Step 12 Complete the "DLP-A377 Provision Section DCC Terminations" task for the working OC-N card that connects to the working card on the new node. Make sure to set the port service state in the Create SDCC Termination dialog box to IS. (Do not create a DCC termination for the protect card.)

Step 13 From the View menu, choose Go to Network View. Verify that the newly created linear ADM configuration is correct. Two green span lines should appear between each linear node.

NTP-A323 Add a Node to a Linear ADM Using the Wizard

This procedure adds a node between two nodes in a 1+1 protection group without losing traffic.

Tools/Equipment

Compatible hardware necessary for the upgrade

Attenuators might be needed for some applications.

Prerequisite Procedures

The in-service topology upgrade procedure requires that the node to be added is reachable (has IP connectivity with CTC). Two technicians who can communicate with each other during the upgrade might be needed if the PC running CTC and the ONS 15454s are not at the same location.

Required/As Needed

As needed

Onsite/Remote

Onsite

Security Level

Provisioning or higher

Note OC-N transmit and receive levels should be in their acceptable range as shown in the specifications for each card in Table 2-5.

Note If overhead circuits exist on the network, an in-service topology upgrade is service affecting. The overhead circuits will drop traffic and have a status of PARTIAL after the upgrade is complete.

Step 1 Complete the "DLP-A60 Log into CTC" task at a linear ADM node that will connect to the new node. If you are already logged in, continue with Step 2.

Step 2 In network view, right-click the span between the two nodes where you want to add the new node. A dialog appears.

Step 3 Select Upgrade Protection. A drop-down list appears.

Step 4 Select Terminal to Linear and the first page of the upgrade protection: terminal to linear dialog box appears.

Step 5 The dialog box lists the following conditions for adding a new node:

•The terminal network has no critical or major alarms.

•The node that you will add has no critical or major alarms.

•The node has compatible software version with that of the terminal nodes.

•The node has four unused optical ports matching the speed of the 1+1 protection and no DCC has been provisioned on these four ports.

•Fiber is available to connect the added node to the terminal nodes.

If all of these conditions are met and you wish to continue with the procedure, click Next.

Step 6 Enter the node host name or IP address, or choose the name of the new node from the drop-down list. If you type in the name, make sure it is identical to the actual node name. The node name is case sensitive.

Note The Back button is not enabled in the wizard. You can click the Cancel button at this point and choose the Yes button if you want to cancel the upgrade protection procedure. If the procedure fails after you have physically moved the fiber-optic cables, you will need to restore the cables to the original positions and verify through CTC that traffic is on the working path of the nodes before restarting the process. To check traffic status, go to node view and click the Maintenance > Protection tabs. In the Protection Groups area, click the 1+1 protection group. You can see the status of the traffic in the Selected Group area.

Step 12 Click Next on the Update Circuit(s) on Node-Name page to continue with the procedure.

Step 13 The Force Traffic to Protect Path page states that it is about to force the traffic from the working to protect path for the terminal nodes. When you are ready to proceed, click Next.

Step 14 Follow each step as instructed by the wizard as it guides you through the process of refibering the working path between nodes and forcing the traffic back to the working path.

Step 15 The Force Traffic to Working Path page states that it is about to force the traffic from the protect to working path for the terminal nodes. When you are ready to proceed, click Next.

Step 16 The Completed page appears. This page is the final one in the process. Click Finish.

Stop. You have completed this procedure.

NTP-A313 Remove an In-Service Node from a Linear ADM

Purpose

This procedure removes a node from a linear ADM without losing traffic.

Note The 1+1 protection group must be unidirectional in order to delete a node from a linear ADM. If your 1+1 protection group is bidirectional, see the "DLP-A154 Modify a 1+1 Protection Group" task to change it to unidirectional. After you have removed the node from the linear group, you can change the protection setting back to bidirectional.

b. Verify that no unexplained alarms appear on the network. If unexplained alarms appear, resolve them before continuing. Refer to the Cisco ONS 15454 Troubleshooting Guide if necessary.

Step 4 Click the Conditions tab. Verify that no unexplained conditions appear on the network. If unexplained conditions appear, resolve them before continuing. Refer to the Cisco ONS 15454 Troubleshooting Guide if necessary.

Step 5 On the network map, double-click a node in the 1+1 protection group that is adjacent to the node you intend to remove from the group (the target node).